Pull switch socket



PULL SWITCH SOCKET Filed May 51, 1929 2 Sheets-Sheet 1 29 M INVENTOR.

fm/flf/ 4 y/a jw fl mam June 5, 1934. P. D. PHILLIPS PULL SWITCH SOCKET 2 SheetsSheet 2 Filed May 51, 1929 fw/yfii l- /MTTORNEYS.

Patented June 5, 1934 PATENT OFFICE PULL SWITCH SOCKET Paul D. Phillips, Chicago, 111.,

assignor to Benjamin Electric Manufacturing Company, Chicago, Ill., a corporation of Illinois Application May 31, 1929, Serial No. 367,327

13 Claims.

My invention relates to pull switch sockets.

One of the objects of my invention is to provide a pull switch socket construction which will comprise a relatively few parts and. which parts will be of relatively simple construction and easy to assemble.

Further objects will appear from the description and claims.

In the drawings, in which an embodiment of my invention is shown- Figure l is a sectional part elevational view of my improved pull switch socket;

Fig. 2 is a top plan View of the socket with the cap removed;

Fig. 3 is a bottom interior;

Fig. 4 is a perspective view of the shell contact and securing means;

Fig. 5 is a vertical axial section through the switch mechanism;

Fig. 6 is a section on the line 6-6 of Fig. 5;

Fig. 7 is a detail View showing a ratchet construction;

Fig. 8 is a perspective View of a sheet metal stamping forming part of the chain reel;

Fig. 9 is a perspective view of a sheet fibre stamping forming part of the chain reel;

Fig. 10 is a plan view of the blank from which the fibre piece shown in Fig. 9 is formed;

Fig. 11 is a sectional view on the line 11-11 of Fig. 10;

Fig. 12 is a perspective view of part of the ratchet mechanism;

Fig. 13 is a section on the line 18-13 of Fig. 12.

Fig. 14 is a detail sectional view. of the chain reel; and

Fig. 15 is an axial sectional view through the shell contact and associated parts.

Referring to the drawings in detail, the construction shown comprises an insulating base 1, a shell contact 2 mounted thereon, a center contact and conductor member 3, and pull switch mechanism also mounted on the insulating base, a fibre shell or lining 4 in which the socket interior is encased, a metal shell or casing 5 surrounding the fibre shell, and a cap member 6 having a suitable detachable connection with the metal shell.

The fibre shell is notched out on opposite sides as indicated at 7, toposition the socket interior and chain guide or horn 8 for the pull chain 9. In order to efiect this positioning, the insulating base is provided with bosses 10 fitting in these notches 7, the edges of the bosses engaging the cut edges of the fibre shell to position the inplan view of the socket sulating base against both endwise and rotary movement in the shell.

The tubular chain guide 8 is mounted on a sheet metal stamping 11 of ribbon stock, which is bent to provide a portion overlying the chain 9 '60 to keep the chain in place. This stamping has a pair of notches 12 in its opposite edges to receive corresponding projections 13 on the insulating base for positioning the stamping. .The stamping is held against upward movement by '65 the engagement of the lower edge of the metal cap 6 with the inclined portion 14 of the stamping. This mounting strap thus serves not only to keep the chain in place but also to position the socket interior and to act as a housing for the switch interior to keep the wires out of the switch.

The threaded shell contact 2 is held in place on the insulating base by means of a U-shaped member 15, the hooklike arms of which are inserted through apertures in the flange 16 of the shell contact, as shown in Fig. 4, so that these hooks 17 can hook over suitable projections 18 on the insulating base, as shown in Fig. 1.

These projections 18 are provided with sloping faces 19 to be engaged by the upper edges 20 of the hook arms to cause these arms to spread apart as the shellis being assembled on the base until the lower edges of the hook projections snap over the upper edges of the projections 18 on the insulating base.

One of the wiring terminals is mounted on one of the arms of this U-shaped member, the binding screw 21 of this terminal being threaded into a nut seated in a recess in the insulating base.

The pull switch construction shown comprises a central supporting pin 22 secured to a sheet metal member 3 of ribbon material, the lower end of which is bent over to form a center contact 23, an 'S-shaped contact member 24 rotatably mounted on this central pin 22, a chain reel 25 'oscillatable back and forth and. acting as a ratchet to give a step-by-step unidirectional movement to the contact member 24, and a coil torsion spring 26 for returning the chain reel after it has been actuated by the pull chain.

The chain reel 25 comprises a formed sheet fiber stamping 27 serving as an insulating mounting for certain metal parts and acting as a ratchet member for giving the contact member 24 a step-by-step movement, and a sheet metal stamping 28 (Fig. 8) forming a supporting framework for the chain reel and providing a securing means for the pull chain 9. The formed fiber member 27 is shaped to provide two octagonal wing portions 29, which provide flanges for the pull chain, and a central connection portion 30 over which the pull chain runs, as shown in Fig. 1. The fiber stamping and metal stamping are assembled by inserting the two tongues 31 and 32 of the metal stamping through the two slots 33 and 34 in one of the wings of the fiber stamping. The longer tongue 32 of the metal stamping serves as a stop member to limit the movement of the chain reel by engagement with suitably positioned shoulders 35 and 36 (Fig. 1) on the insulating base 1, which limit the oscillatory movement of the chain reel to a trifle over 180.

The step-by-step movement of the contact member 24 is effected by means of a pair of projecting portions 37 of the wing portion 29 of the fiber stamping as shown in Figs. 10 and 11, these projections being formed by cutting slots 38 in the fiber and pressing the fiber to give an S-shaped formation to the cut edge so that a portion of this cut edge will project outwardly in position to engage the rear end 39 of the curved portion of the contact as shown in Fig. '7 so that successive oscillations of the chain reel will impart a stepbystep rotation to the contact member 24. In order to provide attaching means for the end of the torsion spring 26 a lip 40 is punched out from the fiber stamping underneath which the end of this spring 26 may be engaged, as will be seen from Figs. 1 and 9. In assembling the pin 22, being already secured to the stamping 3, the contact 24 is slipped over the pin, the chain reel assembly is then slipped on the pin, the torsion spring'26 is then slipped over the pin and the switch assembly is then mounted on the base 1 by inserting the stamping 3 down through the opening in the base provided therefor and bending over the end of the stamping to provide a center contact 23. The circuit is from the binding terminal 41 and binding plate and contact member 42 through the step-by-step contact 24 and stamping 3 to the center contact 23, and from the shell contact 2 to the binding terminal 21.

In operation, each successive pull on the chain 9 effects an oscillation of the chain reel of 180 and this effects a step-by-step movement of the contact 24 of 180, alternately connecting and disconnecting the spring tip 43 of the S-shaped contact with respect to the contact face 44 of the stamping. As indicated in Fig. 1, the end ball of the chain is held in position between the lip portion 45 of the metal stamping and the connecting strap portion 30 of the fiber stamping, the chain being engaged in a wellknown manner in the notch 46.

It will be seen that the construction comprises a relatively smaller number of comparatively simple parts which may be easily and quickly assembled.

While I have shown but one embodiment of my invention, it is tobe understood that many modifications may be made therein withoutdeparting from the spirit and scope of the appended claims.

I claim:

1. A pull chain socket construction comprising a pull chain, an oscillatable member to which the chain is secured, a tubular guide through which the chain extends, and a metal member on which said guide is mounted having a portion integral therewith extending over that portion of the chain adjacent the oscillatable member to keep the chain in place.

2. A pull chain socket construction comprising a pull chain, an oscillatable member to which the chain is secured, a tubular guide through which the chain extends, and a metal member on which said guide is mounted having a portion integral therewith extending over said oscillatable member to keep stray wiring from the switch interior.

'3. A lamp socket comprising a cylindrical casing, a cylindrical fiber lining in said casing having its upper edge out out to provide cut edge, and a socket interior comprising an insulating base in the upper end of said fiber lining, a pull switch mounted on said base, a pull chain for operating said switch, and a tubular guide for said pull chain, said base having a laterally extending portion resting on said out edge and positioning the tubular guide with respect to the fiber lining.

4. A pull switch mechanism for a pull switch socket comprising an oscillatable chain reel and a pull chain secured thereto, said chain reel comprising a member of insulating sheet material having two parallel wing portions forming flanges between which the chain is retained in place, and an integral portion connecting said wing portions to stiffen and position them.

5. A pull switch mechanism for a pull switch socket comprising an oscillatable chain reel and a pull chain secured thereto, said chain reel comprising a member of insulating sheet material having two parallel wing portions forming flanges between which the chain is retained in place, and an integral portion connecting said wing portions to stiffen and position them, said chain running over said integral connecting portion to give increased leverage during initial movement.

6. A chain reel construction for a pull switch mechanism comprising a shaft, a sheet fiber 'member and a sheet metal member, said fiber member having two wing portions providing flanges between which the chain is retained, and an integral portion connecting said wing portions, said wing portions having openings through which said shaft extends, whereby said fiber member is oscillatably mounted on said shaft, said sheet metal member having a base portion lying against the inner face of one of said wing portions and two chain engaging and supportingmembers integral with said base portion and extending therefrom to and through member and a sheet metal member, said fiber member having two wing portions providing flanges between which the chain is retained, and an integral portion connecting said wing portions, said wing portions having openings through which said shaft extends, whereby said fiber member is oscillatably mounted on said shaft, said sheet metal member having a base portion lying against the inner face of one of said wing portions and two chain engaging and supporting members integral with said base portion and extending therefrom to and through openings in the other wing portion, said sheet metal member having provisions whereby the chain may be secured thereto.

8. Achain reel construction for a pull switch mechanism comprising a shaft, a sheet fiber member and a sheet metal member, said fiber member having two wing portions providing flanges between which the chain is retained, and an integral portion connecting said wing portions, said wing portions having openings through which said shaft extends, whereby said fiber member is oscillatably mounted on said shaft, said sheet metal member having a base portion lying against the inner face of one of said wing portions and two chain engaging and supporting members integral with said base portion and extending therefrom to and through openings in the other wing portion, one of said extending portions serving as a stop to limit the oscillatory movement of said reel.

9. A pull switch construction comprising an insulating base, a contact member rotated step by step and a stationary contact member engageable and disengageable with respect to said rotatable contact member and mounted on said insulating base, said insulating base having a recess in which the switch mechanism is mounted and a wall surrounding said recess, said stationary contact member comprising a U-shaped sheet metal member straddling a portion of said Wall.

10. A pull switch construction comprising an insulating base, a contact member rotated step by step and a stationary contact member engageable and disengageable with respect to said rotatable contact member and mounted on said insulating base, said insulating base having a recess in which the switch mechanism is mounted and a wall surrounding said recess,

, said stationary contact member comprising a U-shaped sheet metal member straddling a portion of said wall, and a binding screw cooperating with the outer part of said U-shaped member to form a binding terminal.

11. A socket construction comprising an insulating base and a shell contact mounted thereon having an inwardly extending apertured flange and means for securing said shell to said base comprising a U-shaped strip having its central portion lying within said shell and its arms extending upwardly through said apertured flange and embracing said insulating base.

12. A pull switch socket construction compris ing a rotatable contact member, means including an oscillatable member for giving a step-bystep rotation to the rotatable member, a pin on which both said members are mounted, a supporting base having a recess to receive the end of said pin, and means for holding said pin in place in said recess on said supporting base comprising a sheet metal member having an opening through which said pin extends, said base having an opening through which the sheet metal member extends, said sheet metal member having a portion bent over to hold it in place on the base.

13. A pull switch socket construction comprising a rotatable contact member, means including an oscillatable member for giving a step-bystep rotation to the rotatable member, a pin on which both said members are mounted, a supporting base, and means for holding said pin in place on said supporting base comprising a sheet metal member having an opening through which said pin extends, said base having an opening through which the sheet metal member extends, and said sheet metal member having a portion bent over to hold it in place on the base and to provide a socket contact.

PAUL D. PHILLIPS. 

